Boiler-furnace.



N0. 634,39l. Patented Oct. 33,4899.

s. w. BUTTEBFIELD.

BOILER FURNACE.

(Application m Feb. 23, 1899.)

(No Model.) 2 Shank-Sheet l,

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' Patented Oct. -3, I899.

2 Sheets-Sheet z fl Z////////////////// /N VENT 0f? A7TORN Ill llllllllllllllllllll S. W. BUTTEBFIELD.

BOILER FURNACE.

(Application filed Feb. 28, 1889.)

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(No Model.)

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NITED STATES PAT NT FI EQ BOILER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 634,391, dated October 3, 1899.

Application filed February 23.1899. Serial No. 706,519. (No model.)

To all whom it may concern:

Be it known that I, SAMUEL W. BUTTER- FIELD, a citizen of the United States, residing at Three Rivers, in the Province of Quebee and Dominion of Canada, have invented anew and ImprovedBoiler-Furnace, of which the following is a full, clear, and exact de- The object of the invention is to providea new and improved boiler-furnace which is simple and durable in construction, more especially designed for burning mill refuse and coal, or either, and arranged toinsure a complete combustion of the burning fuel and a consequent economical and quick generation of steam in the boiler.

The invention consists of novel features and parts and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

A practical embodiment of my invention is represented in the accompanying drawings, forming a part of this specification,in which similar characters of reference indicate corresponding parts in all the views.

' Figure l is a sectional side elevation of the improvement on the line 1 l in Fig. 2. Fig. 2 is a front elevation of the same, with part in section, on the line 2 2 in Fig. 1; and Fig. 3 is a plan view of the same, with part in section, on the line 3 3 in Fig. 1.

As shown in the drawings, two boilers A are mounted in the brickwork B; but it is evident that more than two boilers or only a single boiler may be arranged in the brickwork. Each boiler is provided with the usual smoke-fines to permit the products of combustion to pass through the same from the rear of the brickwork to the smoke-box and to the chimney in the usual manner.

Under the front end of each boiler A is arranged a fire-box 0, having a grate D leading to the ash-pit E, and the said fire-box C receives its fuel through a door F in the top of the fire-box at the front end of the boiler, as plainly illustrated in Figs. 1 and 3, the door when opened permitting of dropping fuel down upon the inclined forward end D of the grate D, from which the fuel slides down upon the grate proper. The door F in addition to serving as a fuel-supply also serves as an airsupply, and for this purpose is preferably provided with a damper F", as is plainly indicated in Fig.

The forward end of the inclined portion of the grate D rests on the rear end of a bridgewall G for a second fire-box H, arranged in frontof the fire-box O and having communication therewith over said bridge-wall under the fuel-supply door F. This second fire-box H is provided with a grate I, below which is an ash-pit J, having a door J for removal of the ashes and for allowing air to pass to the under side of the grate I to insure proper burning of the fuel on the grate I. The firebox H is also provided on top with fuel-supply doors K' for introducing sawmill refuse or other material, such as coal, to be burned 011 the grate I, it being understood that coal is preferably used as fuel for the firebox G.

In order to supply the necessary air to the fuel on the grate D in the fire-box O, I provide inclined draft-pipes L, extending at the sides of the door J through the ash-pit J and the rear wall J thereof into the ash-pit E, so that air can pass frointhe outside through the said draft-pipes L to the ash-pit E and from there to the burning fuel on the grate D. The ashes in the ash-pit E can be removed either through a side door E or in case of a nest of boilers through a door in the wall J 2 and leading to the ash-pit J.

As shown in Fig. 1, the grate D- of the inner fire-box is placed on a higher level than the grate I of the outer fire-box. This arrangement brings the inner grate nearerto the boiler and gives room in the outer firebox for a large amount of fuel. The smoke and gases from the fuel in the outer fire-box pass over the bridge-wall and come in direct contact with the flames from the fuel in the inner fire-box and are ignited, insuring a perfeet combustion at the front end of the boiler raked from time to time, and if desired or necessary fuel may be introduced through the door. The top of the firebox II is preferably made in the form of a water-jacket O for heating the feed-water before passing to the boiler A; but this construction is not essential, as the top may be made of tire-brick instead of in the form of a water-jacket.

\Vhen the furnace is in use and fuel is burning on both grates D and I, then the smoke and gases from the tire-box H pass over the bridge-wall G to be burned by the flames rising from the burning fuel in the tire-box C, and the burning of these gases produces a high heat for consuming the smoke rising from the fuel on the grate D to insure a complete consumption of all the smoke from both fireboxes, and all the heat passes finally over the bridge-wall C of the fire-box C under the boiler A to the rear of the brickwork B to then pass through the smoke-tlues of the boiler A into the smoke-box thereof and finally to the chimney.

Thus by having two fireboxes located one in front of the other a complete combustion of the burning fuel in both the fire-boxes II and C is had, so that the units of heat are all utilized in the generation of steam in the boiler A. At certain stages of the burning of the fuel in the fire-boxes II and U itis necessary to admit air through the damper F to insure a complete combustion of the fuel in both of said fire-boxes. Vhen it is desired to burn mill refuse, I prefer to charge the firebox 0 with such refuse as the fuel and use coal as fuel on the grate I in the fire-box II; but this course is not essential, as both fireboxes may be charged with mill refuse as the fuel or with coal or other combustible material.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. A boiler-furnace provided with a boiler, a fire-box under the front end of the boiler and in close proximity to the boiler, a second fire-box in frontof the first-named fire-box and outside of the frontof the boiler and having communication with the inner fire-box over a bridge-wall located between the fireboxes, the grate of the inner fire-box being on a higher level than that of the outer fire-box, substantially as described.

2. A boiler-furnace provided with a boiler, a fire-box under the front end of the boiler and in close proximity thereto, a second firebox in front of the first fire-box and outside of the front of the boiler and having communication with the inner fire-box over a bridgewall located between the fire-boxes, the grate of the inner fire-box being on a higher level than that of the outer fire-box, each fire-box having an independent fuel-feed and an airsupply at its ash-pit, substantially as shown and described.

3. A boiler-furnace provided with a boiler, a fire-box under the front end of the boiler and in close proximity thereto, a second firebox in front of the first-named fire-box and outside of the front of the boiler and having communication with the inner fire-box over a bridge-wall located between the fire-boxes, the grate of the inner fire-box being on a higher level than that of the outer fire-box, a door at the front of the ash-pit of the outer fire-box for ad mission of air, and draft pipes or fiues opening at the front of the ash-pit of the outer fire-box and extending into the ashpit of the inner fire-box, substantially as shown and described.

t. A boiler-furnace provided with aboiler, a fire-box in close proximity to the boiler and under the front end thereof, a second fire-box located in front of the first fire-box and outside of the front of the boiler, a bridge-wall between the fire-boxes and over which the products of combustion pass from the outer fire-box to the inner fire-box, the grate of the inner fire-box being on a higher level than that of the outer fire-box and located at or near the top of the bridge-wall, each fire-box having an independent fuel-feed, an air-inlet at the front of the ash-pit of the outer firebox, and inclined draft-pipes extending from the front of the furnace through the outer ash-pit and the bridge-wall, to the ash-pit of the inner fire-box, substantially as described.

SAMUEL \V. B UTTERFIELD.

IVitnesses:

THEO. G. HOSTER, JNo. M. BITTER. 

